Place the chocolate chunks in a non-stick saucepan with the condensed milk and butter. Melt the ingredients gently over a low heat, stirring occasionally until smooth and silky.
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Step 2
Sieve in the icing sugar and mix everything together thoroughly.
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Step 3
Add in the orange pieces, mixing well so they are evenly distributed.
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Step 4
Press the fudge into the tin and smooth over the top with the back of a spoon.
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Step 5
Chill in the fridge for 1 hour until set, cut into squares. Store in an airtight container in the fridge for up to 2 weeks.